Other Noncurrent Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Other Noncurrent Liabilities [Abstract]
Pension liabilities	$ 40,981	$ 49,820
Postretirement benefits other than pensions	56,052	78,821
Interest rate swap agreement	3,119	4,718
Incentive and deferred compensation	4,960	2,087
Other	902	566
Total	$ 106,014	$ 136,012